Semi-empirical Quantum Chemistry Method ... as to produce results that best agree with experimental data, but sometimes to agree with ab initio results ... calculations are much faster than their ab initio counterparts ... many years, the PPP method outperformed ab initio excited state calculations ...

Multitier Architecture - Three-tier Architecture ... The JIL would call a wrapper script on Ab Initio server which calls an Ab Initio graph ... Ab Initio is an excellent ETL tool which can extract data from multiple databases on multiple data servers and process it ...